504 MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
V = 1 + -O^lisea^ + -053 3 7 0 4^3 _ -0853364^3 
for tlie thermal expansion (Thorpe and L. M, Jones, loc. cit.). 
Taking 
= -005361 7^3 = ”002465 (calculated) = -003653 
= 0°'32 ^3 = 76°-25 t .2 (from curve) = 34°-18, 
we obtain the formula 
_ 36-972 
~~ (139-33 + ’ 
which gives values in good agreement with those obtained by observation. 
Mean temji. 
V 
Difference. 
Observed (mean). 
Calculated. 
0 
0-3-2 
-005.361 
•005361 
•000000 
7-04 
-004923 
•004929 
+ -000006 
14-10 
-004522 
•004530 
+ -000008 
21-31 
-004170 
•004173 
+ -000003 
28-.36 
-003861 
•003864 
+ -000003 
35-42 
-003586 
•003589 
+ -000003 
42-49 
-003342 
•003.343 
+ -000001 
48-72 
-003149 
•003148 
- -000001 
55-92 
•002944 
•002943 
- -000001 
63-74 
•002750 
•002743 
- -000007 
70-26 
•002595 
•002592 
- -000003 
76-25 
•002465 
•002465 
•000000 
Diethyl Ketone. CH 3 .CH 3 .CO.CH 2 .CH 3 . 
A sam]jie of this compound, lent to us by Dr. Japp, and prepared by Kahlbaum 
from barium propionate by Krafet’s method, was carefully fractionated, and 
eventually a portion was obtained which boiled between 100°-9 and 101°'95. 
Bar. 745-3 millims. Corrected and reduced b.p. = 102°-1. 
A determination of its vapour density gave 41-98. Calculated, 43-0. 
The viscosity observations gave :— 
